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Grid-connected inverter is an important part of the grid-connected system. Compared with the traditional L or LC filter, LCL filter has a better high-frequency harmonic attenuation performance. However, LCL filter has resonant peak, which has a great influence on the stability of the system. This paper first analyzes the effect of passive damping method on the resonance peak; then a double closed-loop...
Incorporating cognitive radio technology into wire-less sensor networks enables the sensor nodes to use the idle channels to meet their communication demands, but the spectrum sensing process inevitably brings extra energy consumption. Since cognitive sensor nodes are generally low-powered with limited batteries, we consider a novel spectrum sensing scheme with combined clustering and censoring for...
Power switch devices which base on wide band-gap (WBG) semiconductor, such as silicon carbide metal-oxide-semiconductor-field-effect-transistor (SiC MOSFET) and gallium nitride high-electron-mobility transistor (GaN-HEMT) perform superior performance as compared with silicon (Si) MOSFET in high switching frequency, high blocking voltage, and high temperature operation. In this paper, a series of characteristic...
Vacuum switchgear technology is widely used in the worldwide in all kinds of medium-voltage distribution system for its outstanding technical performance and low life-cycle costing. Now, some manufactures have started to expand this technology to high voltage transmission level. A new developed SF6-Free Hybrid-Gas-Insulated-Switchgear in China is introduced in this paper, which uses a single vacuum...
Magnetic components are very important part in the power electronics system. Given weight and constrain space in the power converter, high power density converter is increasely required. In the whole system, half of the weight are the magnetic components. For the grid-connected system, the LCL filter is a necessary part to suppress the noise due to the high switching frequency transistor appeared...
Computer-aided diagnosis (CAD) systems have been verified to have the potential to assist radiologists in clinical diagnosis to detect and characterize focal liver lesions (FLLs) based on single- or multiphase contrast-enhanced computed tomography (CT) images. Features extracted from multiphase contrast-enhanced CT images carry more important diagnostic information i.e. enhancement pattern and demonstrate...
This paper demonstrates a 60kHz 50kW/400Hz grid facing three-phase power converter using commercially off-the-shelf Silicon Carbide (SiC) module. The power converter is designed to achieve high gravimetric density for possible application in future aircraft. In order to achieve high power density, the power converter is operated with high switching frequency to minimize its LCL filter size that connects...
Content-based image retrieval (CBIR) technique for digital image searching has been applied in medical images which are called content-based medical image retrieval (CBMIR). In this paper, we combine texture, density and shape features for CBMIR based on 3D multi-phase contrast enhanced CT images according to radiologists' clinical experience. And a database of 132 focal liver lesions (FLLs) with...
The harmonics and electromagnetic interference (EMI) generated by grid-connected power converter have to be well filtered by a passive filter to achieve electromagnetic compatibility (EMC). This paper evaluates the performance of two different winding methods of a LCL filter in a grid-connected high power density converter (HPDC) for the purpose of power quality control and EMI suppression. The foil-would...
Power quality and electromagnetic interference (EMI) control are mandatory for any grid-connected power converter. This paper describes a procedure for LCL filter design in a grid-connected high power density converter (HPDC) with the objective to meet both power quality and EMI requirements. The performance of the LCL filter is simulated and then validated experimentally.
This paper presents the extraction of common mode (CM) and differential mode (DM) inductances of a common mode choke (CMC) using 3D finite element method (FEM). For optimal performance of the CMC, the effects of CM and DM currents on the magnetic core saturation are investigated. As the parasitic capacitance of a CMC is a critical parameter that affects its high frequency performance, the parasitic...
As SiC MOSFET is moving towards high current rating through parallel devices in a module, the ability to switch it fast with minimum switching loss becomes a new challenge. Amid this new challenge, power converter designers need to deal with more demanding measurement method to obtain correct switching waveforms. Switching waveforms are an important asset for converter designers because they can reveal...
The high-speed switching of SiC MOSFET allows power converter to operate with higher frequency and lower switching loss. However, it tends to aggravate dv/dt effect due to the impact of parasitic parameters, resulting in shoot-through and high device stress in the half bridge configuration. In this study, a compact and high-speed gate driver is developed and optimized for SiC half bridge module. The...
This paper evaluates different passive filter topologies of the grid-connected high power density converter (HPDC) for the purpose power quality control and electromagnetic interference (EMI) reduction. The harmonics generated by the switching circuits in the HPDC affect power quality at lower frequency as well as EMI at higher frequency. Various common passive filter topologies are carefully evaluated...
Pilot contamination has become a major capacity bottleneck in massive MIMO systems. To mitigate pilot contamination, a novel cell sectorization-based pilot assignment (CS-PA) scheme is proposed in this paper. By separating the users that transmit the same pilot in physical space, the pilot transmitted by the user in each sector is orthogonal with pilots transmitted by the users in adjacent sectors...
Cooling systems significantly contribute to the total mass and/or volume of power electronic systems especially for aerospace application where it will directly increase the operating cost of the aircraft. This paper investigates the heat sink parameters that contribute to the thermal resistance as well to weight of the high power density converter. The lowest heat sink thermal resistance for any...
This paper presents a design methodology for high power density converter (HPDC) operating as an AC aircraft bus provider, which presents a particular gravimetric power density challenge. High power rating 3-phase AC-DC converter design with weight minimization is elaborated. By considering sizing of major converter parts that contribute to total converter weight, optimal switching frequency to yield...
In applications of modern power distribution with distributed energy resources, grid-tied energy storage systems (ESS) will be increasingly incorporated. Energy storage devices (ESD) such as lithium-ion battery or super-capacitor cells however have low DC terminal voltages. It is essential to develop a bidirectional DC/AC converter to interface ESS based on low voltage cells to the higher voltage...
Applying Jiles-Atherton (JA) model to investigate the nonlinear inductance performance in the electronic ballast is a challenge but very attractive issue since it is possible to carry out continuous simulation with only several input parameters. In this paper J-A model has been successfully applied to model the dynamics of resonant inverter for driving a non-linear load: a fluorescent lamp. A semi-theoretical...
This paper presents a lighting system of two-stage fluorescent lamp electronic ballast. The two-stage electronic ballast is composed of a boost pre-regulator to achieve a high power factor and a full bridge resonant inverter to drive the fluorescent lamp. Average current model control is employed in the power factor correction. Four different resonant tanks are analyzed as the driving circuit. The...
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